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  • erlang中修改list里面tuple—list的值的类型

    有个这样的例子:list里面是多个个tuple—list 或者maps,

    ListA = [[{},{}}],[{},{}]], 举例:

    A = [[{<<"CARDISSUERID">>,<<"2">>},
    {<<"CARDSTOCKTYPE">>,1},
    {<<"CARDTYPE">>,0},
    {<<"DERIVATIVESPRODUCTTYPE">>,1},
    {<<"PARAM_VER">>,<<"195">>},
    {<<"PREASSIGNMENTATTRIBUTE">>,1},
    {<<"PRODUCTTYPE">>,9800},
    {<<"SALEVALUE">>,<<"0">>}],
    [{<<"CARDISSUERID">>,<<"2">>},
    {<<"CARDSTOCKTYPE">>,1},
    {<<"CARDTYPE">>,0},
    {<<"DERIVATIVESPRODUCTTYPE">>,1},
    {<<"PARAM_VER">>,<<"195">>},
    {<<"PREASSIGNMENTATTRIBUTE">>,1},
    {<<"PRODUCTTYPE">>,9800},
    {<<"SALEVALUE">>,<<"0">>}]].

      想把  key是 <<"CARDISSUERID">> 的 值的类型,改成integer ,目前是 binary ,{<<"CARDISSUERID">>,<<"2">>}

    直接上代码,修改对应key的值,直接干:

    [lists:map(fun(X) -> if element(1,X) == <<"CARDISSUERID">> -> 
                                         {element(1,X), binary_to_integer(element(2,X))};
                                true -> X
                         end 
                    end,Z)|| Z<-A].

     执行结果如下: 

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  • 原文地址:https://www.cnblogs.com/unqiang/p/13963346.html
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